Hey there anyone. Anyone know of a good site listing details of replacing the heater core 66, charger?

 

Have you posted this over on the "Blast from the Past" page? There may be some manuals you could get from Auto Zone/Checker, etc., that might help you with this, too. Other than that, I can't offer any help. I had a 66 Dart, but never looked under the dash for anything like that. You may just have to crawl under there and start looking. You will have two hoses running to the firewall under the hood - those carry the hot water/antifreeze to the heater core. Be sure and mark those "right" and "left", or some way so you reconnect them in the same way - one carries the fluid in and the other carries it out. Then, crawl underneath and start removing "stuff". Be careful, cause unless the core has cracked and leaked out everything, there will be a bunch of water/antifreeze still in and you could dump it on your floor. Other than that, I don't know of any "secrets" or "tricks" to doing it.

dave